running the saw on 220V does not impact or improve cutting with the saw, but it does extend motor life and improve the spool-up time on the motor. Motors running on 220V run cooler than on 110V so the motor will last longer running on 220V.
To answer your questions on the differences.
The 2424 will cut 24" right and left of the blade while the 2412 will cut 12" left and 24" right. The 2424 has cast iron wings (vented) and the 2412 has steel wings (solid). The biggest advantage to the vented style wings is the ability to clamp things down to the wings with C clamps (i.e. feather boards, aux. fences, etc.). The cast iron wings are also MUCH sturdier. Finally, the 2424 comes with the Herculift, a must have if you intend to move the saw. If you have never moved one by yourself...THEY ARE HEAVY (my wife and I could barely lift the box to get it in the car at Home Depot)! The caster system is excellent...the saw just glides wherever you need to move it. I don't know exactly what the difference in price is, but in my opinion it is well worth saving up to by the 2424.
Brad Hatchett<br />email@example.com